100 Foot Surveyor's Rope 40 6543 A horizontal circle graduated to DSI HP 64XL 1B1C A horizontal circle graduated to single degrees with a vernier reading to 15 minutes allows controlled angle measurements The SubSurface MUL Gradiometer Magnetic Underwater Locator w Sensor uses advanced detection technology to locate underwater ferrous metals immersed from 10 feet up to 1000 feet The markings on the Keson 100 foot Surveyor's Rope are at standard feet and inches as well as divided into 10ths The clear coat on the Keson 100 foot Surveyor's Rope will allow it to be used in all weather conditions without worrying about it rusting or rotting if it gets wet like other tapes or ropes